Safety guard for centrifugal extractors



March 24, gag sop SAFETY GUARD FOR CENTRIFUGAL EXTRACTORS Original Filed Feb. 27, 1926 3 Sheets-Sheet l '1 ET IN VEN TOR AT ORNEY March 24, 1931. T. A. QBRYSON 1,797,603

SAFETY GUARD FOR CENTRIFUGAL EXTRACTORS Original Filed Feb. 27, 1926 3 Sheets-Sheet 2 0 INVENTOR A TT NEY March 24, 1931. T. A. BRYSON 1,797,603

SAFETY GUARD FOR CENTRIFUGAL EXTRACTORS Original Filed Feb. 1926 3 Sheets-Sheet 5' A ORNEY Patented Mar. 24, 1931 UNITED STATES PATENT omen Ta wan; A. BBYSON, or rac N W YORK, Assmnon, BY vrnsnnnssrennnnrs, o 'ronnnns'r MACHINE wonxs, me, or rao yivnw Yon-K, .A CORPORATION on NEW YORK SAFETY GUARD FOR CENTB-IFUGALjEXTRACTORS Application filed February 27, 192 6, SeriaLNo. 91,012 Renewed July 22, 1930.

My invention relates to safety-guards and more particularly to a safety-guard for centrifu al extractors to prevent the cover of the extractor being opened while the basket is being rotated.

Objects and-advantages of the invention 7 will be set forth in part hereinafter and in constructions, arrangements, combinations and improvements herein shown and described. I

The accompanying drawings, referred to herein and constituting a part hereof, illustrate one embodiment of the invention, and

together with the description,--serve to explain the principles of the invention.

Of the drawings Fig. 1 is a vertical section through a centrifugal extractor equipped with one form of my invention;

Fig. 2 is a detail vertical section, on an enlarged scale, showing the cover or guard open, and the belt stationary.

Fig. 3 is a vertical section on an enlarged scale, similar to Fig. 2, showing the position.

of the parts when it is attempted to open the cover or guard when the basket is being rotated, and the belt is moving in the direction of the arrow;

Fig. 4 is a fragmentary plan view, partly broken away, for purposes of illustration, and showing the drive belt in section;

Fig. 5 is a detail vertical section on the hne 55 of Fig. 1; J

Fig. 6 is a detail enlarged view of thefr1ction member or shoe, illustrating the opposite side ofthe member from that shown in Figs. 1, 2 and 3;

Fig. 7 is a detail view of a modification. For purposes of illustration, I have shown my invention applied to an underdriven centrifugal extractor, though of course-it is understood that it may be applied to an extractor driven in any other suitable manner.

I In the embodiment of my invention shown in the drawings 1 is the case of a centrifugal extractor provided with the usual ring 2, secured toit by any suitable means, such as by the bolts 3, 3. The case is provided with a guard or cover 4, pivoted upon an axle 5,

mounted in the bosses6, 6 (Fig. 4:). This ,7 guard or cover lis provided with acurved surface 7, terminating in anabrupt locking shoulder 8. 1

Fast on the axle 10 mounted on the bracket .9, which bracketissecured to the ring2 'in' any suitable-manner such as by the screws 11, 11'-(Fig. lisahandle 12-,- secured to the axlein any suitable manner, as by the pin 13. Onthis axle 10, is alsorigidly secured by means of a pin 13, a locking member 14;. A portion ofthis locking member 14 is in the, form of a quadrant; thepart 45 of the limit the relative movement of the arm 16,

with relation to the lockingmember 14E. This arm 16 is looselyimounted upon the axle 10 and is held in its proper position bythe colpin 19. Y

The locking Gil lar 18, which is secured to the axle, 10 by the mounted a friction member or shoe 21. This friction member has a notch or cut-away portion 22. and is provided with the stops 23 and 24:. I may rely upon the eccentric mounting of the friction member, upon its axle or arbor 2 0, to insure that normally it will assume the position shown in Figs. 1 and 2.

Preferably, however, I employ a spring 25, I I

having oneend of its endsconnected to the pin 26 on the friction member or shoe, the other end of the spring being connected to an arm 27, secured to the axle or arbor 20. This spring normallycauses the stop 23 on the friction member orshoe 21 to engage with the arm 16, so that the notch 22 will normally receive the lug 28 on the locking member 14 (Fig. 2).

I preferably mount resilient means between the locking member 1 1 and the arm 16, which I have shown as a coil compressionthen being inthe position spring 29, having one of its ends engaging with a lug on the locking member, and its other end engaging with a lug 31, carried by the free arm 16.

Within the path of movement of the friction member or shoe 21, is located some moving part connected to, and moving with, the basket 34. In the form of my invention shown by way of illustration, the drive belt is the member employed to actuate the friction member or shoe 21, though it is to be understood that a pulley, shaft, or any other part moving in unison withthe basket 34 may be employed to actuate the friction member or shoe 21. This drive belt 35 passes around the idler 36, thence around the driven pulley 37 secured to the vertical spindle 38 of the centrifugal separator in any suitable manner such as by the bolt 39, thence around the idler 4:0 to the countershaft and pulleys (not shown) usually mounted on the ceiling.

From the mechanism so far described, it will be clear that when the basket 34: is stationary the belt 35 will also be stationary, so that the operating handle 12 can be moved to the right ofthe position shown in Fig. 1.

' Such movement will compress the spring 29 between the locking member 1 1 and the arm 16, and force the arm 16 ov'er'untilthe friction member or shoe 21 engages with the stationary or non-moving belt 35, when the lug 28 will engage in the notch or cutaway portion 22 of the friction member, or shoe 21. l/Vhen the lug 28 is received in the notch 22 the locking surface of the locking mem ber 14 is withdrawn from engagement'with the shoulder or-locking member 8 of the guard or cover 4, which permits the guard or cover 4 to be lifted so that access may be had to the basket 3% and its contents, the parts shown in 2. If, instead of the basket 34 and belt 35 being stationary, the bas ct is rotating and the belt 35 moving in the direction indicated by the arrows in Figs. 1 and 3, it will be impossible fcr th operator to lift the guard er cover 4, until the mechanism is againstopped.

l Vith the basket -4 rotating and the belt 35 moving in the direction indicated by the arrows, the moment that the handle 1.. is moved to the right to free the locking surface 15 of the locking member 1 1, from the locking shoulder 8of the guard or cover 4, the friction member or shoe 21 will be brought into Contact with the belt 35. This will instantly cause the'friction member or shoe 21 to rock upon its axle or arbor 20, against the action of the spring 25 ,"if such spring be used, bringing the stop 24 into contact with the arm 16. This rocking of'the friction member 21 brings the surface l6 of the friction memberof. shoe 21 into the path of the lug 28, preventing the lug becoming seated in the notch or cutaway portion 22, thereby preventinga suiheient swing or movement of the handle 12, with the locking member 14, to the right, to clear the locking surface 45 from the shoulder or locking surface 8 upon the cover or guard. This will prevent the guard being opened as long as the basket 34 and the belt 35 are moving.

The handle 12 is held inits retracted position by a spring 48 having one end connected with a pin 49 secured to the handle 12, the other end of the spring being secured to the pin 0 mounted on the boss 6 (Fig. 4). r The retractive action of the spring is limited by the stop on the member 14- engaging with the stop 61 on the extractor.

While my safety-guard will be operated by the flexible and freely moving belt 35, I

preferably, though not necessarily, mount an idler 51 on the other sid of the belt so that the belt will be more or less clamped between the idler 51 and the f iction member or shoe 21. This idler may be variously supported, such as by a bracket'52 secured to thecentrifugal extractor 1' by the bolts 53, 53.

Instead of the friction member or shoe 1 being actuated by a belt, it may be actuated by any moving part, which is moved when the basket is 7 -g rotated. I have shown for example in 'Z a modification wherein the pulley 54, rotating as indicated by the arrow. will cause the friction member or shoe I 21 to rock and bring the surface 4-6 intothe path of the lug 28 so as to prevent the opening of the cover or guard 1 as long the basket is rotating, even slowly.

The invention in its broaderaspects is not limited to the specific mechanisms shown and described butdepartures may be made therefrom within the scope of the accompanying claims without departing from the principles of the invention and without sacrificing its chief advantages.

lVhat I claim is V 1. The combination in'a safety guard of a pivoted guard havinga locking surface, a pivoted locking member adapted to cooperate with the locking surface to lock and release the guard and maintained in unlocked position by said guard while said guard is open, an arm, a pivoted friction membermounted on the arm and provided with means to limit the rocking movement of the lOcki omemher, and a driving member with which the pivoted frictionmember is adapted to be engaged.

a pivoted guard having a locking surface, a pivoted locking member adapted to cooperate with the locking surface to lock and release the guard, an arm, a pivoted friction member mounted on the arm and providedwith means to limit the rocking movement of the locking member, and a flexible driving meinher with which the pivoted friction member is adapted to be engaged. Y

3. The combination in a safety guard of a :1

2. The combination in a safety guard of Hill 1,797,eoa

with the locking surface to lock and release.

the guard, an arm, a pivoted friction member mounted on the arm and PIOVlQECl with means to limit therocking movement of the locking member, and a drive belt with which the pivoted friction member is adapted to be engaged.

a. In centrifugal separators a basket, a cover or guard for the basket, flexible drivi'ig means for the basket and friction-actuated locking means for the cover or guard controlled by the said flexible driving means.

5. In centrifugal separators a basket, a cover or guard for the basket, a drive belt to rotate the basket, and pivoted, frictionactuated locking means for the cover or guard controlled y the drive belt. a

6. In centrifugal separators, a basket, a pivoted cover or guard for the basket provided with a locking surface, a pivoted locking member adapted to cooperate with the locking surface of the cover or guard tolock and release the cover or guard, means to rotate the basket, and means actuated by said first means adapted to control th movement of the pivoted locking member and brought into locking position by attempted coveropening movement during operation of said basket rotating means.

7. In centrifugal separators, a basket, a pivoted cover or guard for the basket providedwith a locking surface, a pivoted locking member adapted to cooperate with the locking surface of the cover or guard to lock and release the cover or guard, means to rotate the basket, and pivoted means actuated by said first means adapted to control the movement of the pivoted locking member and brought into locking position by contact with said basket rotating means.

8. In centrifugal separators, a basket, 21 pivoted cover-or guard'for the basket provided with a locking surface, a pivoted locking member adapted to cooperate with the locking surface of the cover or guard to lock and release the cover or guard, drive belt to rotate the basket, and means actuated by the drive belt adapted to control the rocking movement of the pivoted locking member and brought intoilocking position by contact with said drive belt upon attempted coveropening movement during driving motion of said belt.

-9. In centrifugal separators, a basket, a pivoted cover or guard for the basket pro vided with a locking surface, a pivoted locking member adapted to cooperate with the locking surface of the cover or guard to lock and release the cover or guard, a pivoted arm, a pivoted friction member or shoe on the arm provided with an engaging surface to limit the throw of the pivoted locking member, and a drive member adapted to be engaged by the .pivoted friction tion. 7

10. In centrifugal separators a basket, a pivoted cover or guard for the basket pro shoe andcontrol its opera;

ing member adapted to cooperate with the locking surface of the cover or guard to lock vided with a locking surface a pivoted lockand release the cover or ua-rd. a oivoted arm a l a a pivoted friction member or shoe on the arm provided with an engaging surfaceto limit the throwof the pivoted locking. member, and a flexible drive member adapted 1701136611- gaged by the pivoted friction shoe and control its operation. i

,. 11. In centrifugal separators. a basket,-a pivoted cover or guard for the basket provided with a locking'sur'face a pivoted locking member adapted to cooperate with the locking surface of the cover or guard to lock} and release the cover or guard, a pivoted arm,

a pivoted friction member or shoe on the arm provided with an engaging surface ,to limit the throw of the pivoted locking member, and

a drive belt adapted to be engaged byjthe' pivoted friction shoe and controlits operation. f

12. In centrifugalseparators, a basket, a pivotedcover or guard for the "basket pro.- vided with a lockingsurface, an axle or arbor,

a pivoted locking member fast to the axle or r arbor, ahandle fast to the axle or arbor, an arm loosely mounted on the axle or arbor, a pivoted friction member mounted on the loose arm, said member being provided with means to engage with and limit the-throw of the p voted locking member, and a moving member adapted to move as the basket rotates, said pivoted friction member adapted to engage and be operated by the said moving member.

I 13. In centrifugal separators, abasket, a

pivoted cover or guard for the basket provided with a locking surface,an axle or arbor,

pivoted locking member fast to the axle or arbor, a handle fast to the axle or arbor, ,an arm loosely mounted on the axle or arbor,;a pivoted frictionmember mounted on the loose arm, said memberbeing provided with means to engage with andlimit-the throw ofthe pivoted locking member, and adrive belt adapted to drive the basket, said pivoted friction member adapted to engage the drive belt and be operated'by it.

i to 7 f f gi o I l. In centrifugal separators, a basket, a v pivoted cover or guard for thebasket .pro-

vided with a locking surface, an axle or arbor, v

a pivoted locking member fast to the axle or arbor andprovided with a lug, a handle fast to the axle or arbor, an arm loosely mounted on the axle or arbor, a pivoted friction member mounted on the loose arm said member being provided with an engaging surface and a cutaway portion to cooperate with the lug on the pivoted locking member to'control the throw of said member, anda moving member adapted to move as the basket rotates, said pivoted friction member adapted to engage and be operated by the said moving member.

15. In centrifugal separators, a basket, a pivoted cover or guard for the basket provided witha locking surface, an axle or arbor, a pivoted locking member fast to the axle or arbor and provided with a lug, a handle fast to the axle or arbor, an arm loosely mounted on the axle or arbor, a pivoted friction member mounted on the loose arm, said member being provided with an engaging surface and a cutaway portion to cooperate with the lug on the pivoted locking member to control the throw of said member, and a drive belt adapted to drive the basket, said pivoted friction member adapted to engage the drive belt and be operated by it.

16. In centrifugal separators a basket a -pivoted cover or guard for the basket pro- 'vided with a locking surface, an axle or arbor,

a pivoted locking member fast on the axle or arbor and provided with a lug, a handle fast on the axle or arbor, an arm loosely mounted on the axle'or arbor, yielding means between the pivoted locking member and the loose arm, a pivoted friction member or shoe mounted on the loose arm, providedwith engaging and cutaway surfaces to cooperate with the lug on the pivoted locking member, and means to rock the friction member or shoe if the guard or cover is attempted to be opened while the basket is'being rotated.

17. In a machine-having a safety guard, a

controlled guardlocking member brought to guard locking positlon by closing movement of said guard, means for movlng said member to guard unlocking position, and a controlling member preventing such movement during operation of said machine and brought into operative position by attempted unlocking movement of said guard locking member.

18. In a machine provided with a movable driving mechanism and having a safety guard, a controlled guard locking member brought to guard locking position by closing movement of said guard, means for moving said member to guard unlocking posltlon, and a controlling memberpreventing such movement during operation of said machine and brought into operative position on attempted unlocking movement of said guard locking member by contact with a part of said movable driving mechanism.

In testimony whereof, I-have signed my name to this specification.

TA DYA. BRYSON. 

